Hi everybody, I´m testing Nagios and Gearman / Mod_Gearman. I´d like to change NSCA with this new approach, as it seems easier to configure and has a lot of advantages. Besides, NSCA and Nagios freshness mechanism have some problems. Gearman and mod_gearman are working well. I have 30000 hosts and 60000 services, and it is increasing! Now I´m having problem with Nagios performance, that eats 100% of CPU and the host and service latency is very big, around 300 seconds. I think that this a Nagios problem, as the gearman_top shows the Job Wainting queue empty almost all the time. It seems that Nagios do not send the active checks all the time, an once in while it sends a burst of active checks. I have a physical central server, running RHEL, with 4 GB of ram, Intel(R) Xeon(R) CPU E5504 @ 2.00GHz (8 CPUs). For the workers I have 9 virtual servers running RHEL too. I've already set the Nagios parameters to large environment, as recommended in the documentation, but it made no difference. Thanks. Nagios Parameters to large environment: - use_large_installation_tweaks=1 - enable_environment_macros=0 - max_concurrent_checks=0 - check_result_reaper_frequency=10Could someone help me? How can I improve Nagios performance to make active checks faster? Thank you very much.